test(ngSanitize): enhance test regarding the xlink:href attribute

Closes #9770

Author: gkalpak

test/ngSanitize/sanitizeSpec.js

@@ -246,6 +246,15 @@ describe('HTML', function() {
   it('should sanitize SVG xmlns:xlink attribute values', function() {
       expectHTML('<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><a xmlns:xhref="javascript:alert()"></a></svg>')
           .toEqual('<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><a></a></svg>');
+
+      expectHTML('<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><a xmlns:xhref="https://example.com"></a></svg>')
+          .toEqual('<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><a></a></svg>');
+
+      expectHTML('<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><a xlink:href="javascript:alert()"></a></svg>')
+          .toEqual('<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><a></a></svg>');
+
+      expectHTML('<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><a xlink:href="https://example.com"></a></svg>')
+          .toEqual('<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><a xlink:href="https://example.com"></a></svg>');
   });
 
   describe('htmlSanitizerWriter', function() {